Patent US3308718A successfully refreshed from Google Patents.
US3308718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter mechanism for slide projectors
Assignee: Individual
•
Filing: 1965-12-15
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Granted: 1967-03-14
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Expires: 1985-12-15
Abstract
No abstract record available.
Inventors
- 👤 Antos Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:57
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/04; G03B23/042; G03B21/00; G03B21/001
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A SHUTTER ASSEMBLY FOR USE WITH A SLIDE PROJECTOR OF THE TYPE EMPLOYING TWIN OPTICAL SYSTEMS COMPRISING, IN COMBINATION, A PAIR OF SHUTTER MECHANISMS RESPECTIVELY ASSOCIATED WITH DIFFERENT ONES OF SAID TWIN SYSTEMS, MEANS FOR SELECTIVELY AND ALTERNATELY OPENING AND CLOSING SAID SHUTTER MECHANISMS, MEANS FOR CONTROLLING SAID SHUTTER MECHANISMS SO THAT CLOSURE OF ONE OF SAID MECHANISMS IS ACCOMPANIED BY OPENING OF THE OTHER OF SAID
Claim 2
Dependent Claim
67 words
A SHUTTER ASSEMBLY FOR USE WITH A SLIDE PROJECTOR OF THE TYPE EMPLOYING TWIN OPTICAL SYSTEMS COMPRISING, IN COMBINATION, A PAIR OF SHUTTER MECHANISMS RESPECTIVELY ASSOCIATED WITH DIFFERENT ONES OF SAID TWIN SYSTEMS, MEANS FOR SELECTIVELY AND ALTERNATELY OPENING AND CLOSING SAID SHUTTER MECHANISMS, MEANS FOR CONTROLLING SAID SHUTTER MECHANISMS SO THAT CLOSURE OF ONE OF SAID MECHANISMS IS ACCOMPANIED BY OPENING OF THE OTHER OF SAID
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |